Mid-Race Performance: Polini Corsa 70cc Iron Cylinder
Step up to "Mid-Race" power with the Polini Corsa Cylinder Kit. While based on the legendary Polini 70cc Sport, the Corsa is factory-tuned with revised port timing and a polished exhaust port to deliver significantly more horsepower and higher RPM ceilings. This cast-iron kit combines the bulletproof reliability of a daily driver with the aggressive acceleration required for the track.
Technical Performance Features
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Factory Ported: Features hand-finished porting from Polini technicians to optimize scavenging and increase top-end power compared to the standard 70cc Sport kit.
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Thermal-Resistant Cast Iron: Provides a rugged, long-lasting bore that can be honed and oversized if needed, offering better durability for high-heat racing conditions.
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Chrome-Plated Piston Rings: Includes specialized high-tension rings designed to reduce friction and maintain a perfect seal at high crankshaft speeds.
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10mm Wrist Pin: Engineered specifically for the standard 10mm small-end bearings found on horizontal Minarelli and Genuine 50cc engines.
Comprehensive Fitment Guide
This kit is designed for Horizontal Minarelli-based 2-Stroke engines. It is a direct-fit performance upgrade for:
| Brand |
Compatible 50cc 2-Stroke Models |
| Genuine Scooter Co. |
Buddy 50, RoughHouse 50, Rattler 50, Black Jack 50 |
| Yamaha |
Zuma 50 (2002-2011), Vino 50, Jog (Horizontal) |
| Aprilia |
SR50 (Pre-2000 Minarelli Engine) |
| Malaguti |
F12 Phantom, F15 Firefox |
Note: Not compatible with AF05E engines (pre-1994 model years).
Specifications
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Displacement: 70cc
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Bore Diameter: 47mm
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Wrist Pin Size: 10mm
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Material: Cast Iron Cylinder / Aluminum Piston
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Cooling: Air Cooled
Mechanic's Note: The Corsa is a high-revving kit. To prevent engine failure, you must increase your oil-to-fuel ratio by adding 1oz of high-quality 2-stroke oil per gallon of gas. Additionally, this kit performs best when paired with at least a 17.5mm or 19.1mm Carburetor and a mid-race expansion chamber exhaust.
Part Number: 1100-1486
Manufacturer: Polini Motori (Italy)
Polini Corsa big bore (70cc) racing cylinder kit for Genuine Buddy 50, RoughHouse 50, and Rattler 50 scooters, Zuma 50 2T, and other horizontal Minarelli-based engines. Not compatible with AF05E engines (pre-1994 model years).
NOTE: It's important to properly break in your big-bore kit for 200-300 miles before running your bike full throttle for any extended length of time. The supplier recommends adding one ounce of 2-stroke oil to your gas tank; 50cc oil injectors
